Hi dronkos
7's means 7 leagues which are another make of Bocks
A lot of people like them but as I said they tend to bottom easily (I bottomed the highest weight stopping from a run)
At your weight you shouldn't bottom they high weight Projumps like I say just ask them for the highest weight ones they do
People seem to think that they come in exact 10kg weight devisions but really they are all weight tested individually
You will find a number writen on the bottom end of the spring and that is the weight in KG
In the past I have had right up to 121kg but they don't go that high very often
Also the newer springs seem to be better made and so long as you can get close to your weight you should be OK
I am on 114's at the moment and that is very close to my weight as I need to loose a few stone
The other thing is if you use them regularly you will lose weight and even at 6ft 5in and covered in muscle the correct weight is lower than 16 stone
Jason